CN216485222U - High-precision circuit sampling circuit - Google Patents
High-precision circuit sampling circuit Download PDFInfo
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- CN216485222U CN216485222U CN202122886174.0U CN202122886174U CN216485222U CN 216485222 U CN216485222 U CN 216485222U CN 202122886174 U CN202122886174 U CN 202122886174U CN 216485222 U CN216485222 U CN 216485222U
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Abstract
The utility model discloses a high-precision circuit sampling circuit, which belongs to the field of circuit sampling and comprises a sampling main control chip U413, wherein the sampling main control chip U413 is of an INA199 type, an IN + port and an IN-port of the sampling main control chip U413 are sampling signal sources, the IN + port of the sampling main control chip U413 is electrically connected with one end of a resistor R329, the other end of the resistor R329 is electrically connected with a BAT-port, the IN-port of the sampling main control chip U413 is electrically connected with one end of a resistor R328, the other end of the resistor R328 is electrically connected with a GND3 port, one end of the resistor R329 is electrically connected with one end of a capacitor C238, and the other end of the capacitor C238 is electrically connected with one end of a resistor R328.
Description
Technical Field
The utility model relates to the technical field of circuit sampling, in particular to a high-precision circuit sampling circuit.
Background
The current amplification detection circuit is generally divided into the following parts in the market: the differential amplification circuit, the reverse addition circuit, the homodromous addition circuit and the analog circuit use the triode amplification circuit, and the design has the defects of low sampling precision, more complex circuits and elements, large temperature drift, easy influence of environmental temperature, inapplicability in occasions with high sampling circuit requirements and difficult control of batch production quality due to poor parameter consistency.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a high-precision circuit sampling circuit, which solves the defects by using an INA199 bidirectional zero drift current shunt monitoring chip, has the characteristics of simple circuit, few elements, high sampling precision, good linearity and no environmental influence on zero drift, and solves the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme: high accuracy circuit sampling circuit, including sampling main control chip U413, sampling main control chip U413 adopts the INA199 model, the IN + port and the IN-port of sampling main control chip U413 are the sampling signal source, the IN + port and the one end electric connection of resistance R329 of sampling main control chip U413, the other end and BAT-port electric connection of resistance R329, the IN-port and the one end electric connection of resistance R328 of sampling main control chip U413, the other end and GND3 port electric connection of resistance R328, the one end and the one end electric connection of electric capacity C238 of resistance R329, the other end and the one end electric connection of resistance R328 of electric capacity C238.
Preferably, the V + port of the sampling main control chip U413 is electrically connected to one end of the resistor R337, the other end of the resistor R337 is connected to a 3.3V voltage, and one end of the resistor R337 is electrically connected to one end of the capacitor C237.
Preferably, the GND port of the sampling main control chip U413 is electrically connected to the other end of the capacitor C237, and the other end of the capacitor C237 is electrically connected to the REF port of the sampling main control chip U413.
Preferably, the OUT port of the sampling main control chip U413 is electrically connected to one end of a resistor R323, the other end of the resistor R323 is electrically connected to one end of a resistor R324, one end of the resistor R323 is electrically connected to the base of a transistor Q76, the collector of the transistor Q76 is electrically connected to one end of a resistor R325, and the other end of the resistor R325 is connected to 14V.
Preferably, the emitter of the transistor Q76 is electrically connected to the emitter of the transistor Q77, the base of the transistor Q77 is electrically connected to one end of the resistor R325, and the collector of the transistor Q77 is electrically connected to the other end of the resistor R324.
Preferably, the collector of the triode Q77 is electrically connected to one end of a resistor R706, one end of the resistor R706 is respectively connected to one ends of a resistor R707, a resistor R708, a resistor R709, a resistor R710, a resistor R711 and a resistor R712, the other end of the resistor R706 is respectively connected to 14V voltage together with the other ends of the resistor R707, the resistor R708, the resistor R709, the resistor R710, the resistor R711 and the resistor R712, and the resistor R706, the resistor R707, the resistor R708, the resistor R709, the resistor R710, the resistor R711 and the resistor R712 are arranged in parallel.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a high-precision circuit sampling circuit, which has the advantages of fewer current sampling elements, high precision, zero drift and the like compared with an amplifier for an LM393 traditional circuit by adopting an INA199 model control chip as a main control chip of the sampling circuit, and three kinds of fixed gains can be selected by voltage output current shunt of the INA199 series chip, namely 50V, 100V and 200V, a low offset zero drift framework enables the current detection to span a full range of the shunt to 10mV at most, and a shunt resistor can be arranged between a load and the ground in a low-side configuration. In the high-side configuration, the shunt resistor is arranged between the power supply and the load, so that the compatibility of the circuit sampling circuit is stronger, the circuit sampling circuit is suitable for different configuration environments, and the problems that the traditional sampling circuit is low in sampling precision, multiple in circuit complex elements and large in temperature drift and is easily influenced by the ambient temperature are solved.
Drawings
Fig. 1 is a circuit sampling circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a high-precision circuit sampling circuit shown in fig. 1, which comprises a sampling main control chip U413, wherein the sampling main control chip U413 adopts an INA199 model, the INA199 model chip has independent power supply voltage, and three kinds of fixed gains can be selected: the sampling main control chip U413 has the advantages of being few IN current sampling elements, high IN precision, zero IN drift and the like, an IN + port and an IN-port of the sampling main control chip U413 are sampling signal sources, and a unique input stage is provided, and the common mode voltage at an input pin is allowed to far exceed the power supply voltage of the device through the input stage.
The IN + port of the sampling main control chip U413 is electrically connected to one end of a resistor R329, the other end of the resistor R329 is electrically connected to the BAT port, the IN-port of the sampling main control chip U413 is electrically connected to one end of a resistor R328, the other end of the resistor R328 is electrically connected to the GND3 port, one end of the resistor R329 is electrically connected to one end of a capacitor C238, and the other end of the capacitor C238 is electrically connected to one end of the resistor R328. In a low side configuration, the shunt resistor is between the load and ground. IN a high-side configuration, where a shunt resistor is placed between the power supply and the load, IN a low-side implementation, IN-is the ground voltage (0V) and IN + is simply a small voltage drop across the shunt resistor above ground, which can be used at either the low-side or the high-side.
The V + port of the sampling main control chip U413 is electrically connected with one end of a resistor R337, the other end of the resistor R337 is connected with 3.3V voltage, one end of the resistor R337 is electrically connected with one end of a capacitor C237, the GND port of the sampling main control chip U413 is electrically connected with the other end of the capacitor C237, the other end of the capacitor C237 is electrically connected with the REF port of the sampling main control chip U413, the OUT port of the sampling main control chip U413 is electrically connected with one end of a resistor R323, the other end of the resistor R323 is electrically connected with one end of a resistor R324, one end of the resistor R323 is electrically connected with the base of a triode Q76, the collector of a triode Q76 is electrically connected with one end of a resistor R325, the other end of the resistor R325 is connected with 14V voltage, the emitter of a triode Q76 is electrically connected with the emitter of a triode Q77, the base of a triode Q77 is electrically connected with one end of the resistor R325, and the collector of a triode Q77 is electrically connected with the other end of the resistor R324, the collector of the triode Q77 is electrically connected with one end of a resistor R706, the collector of the triode Q77 is electrically connected with one end of a resistor R706, one end of the resistor R706 is respectively connected with one ends of a resistor R707, a resistor R708, a resistor R709, a resistor R710, a resistor R711 and a resistor R712, the other end of the resistor R706 is respectively connected with the other ends of the resistor R707, the resistor R708, the resistor R709, the resistor R711 and the resistor R712 to be connected with 14V voltage IN common, the resistor R706, the resistor R707, the resistor R708, the resistor R709, the resistor R710, the resistor R711 and the resistor R712 are arranged IN parallel, analog signals are collected through an IN + port and an IN-port of a sampling main control chip U413, after amplification, the collected analog signals are transmitted to an AD port for sampling through a pin 6 of the sampling main control chip U413, namely an OUT port, and the purpose of current sampling detection is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. High accuracy circuit sampling circuit, including sampling main control chip U413, its characterized in that: the sampling main control chip U413 is of an INA199 type, an IN + port and an IN-port of the sampling main control chip U413 are sampling signal sources, the IN + port of the sampling main control chip U413 is electrically connected with one end of a resistor R329, the other end of the resistor R329 is electrically connected with a BAT-port, the IN-port of the sampling main control chip U413 is electrically connected with one end of a resistor R328, the other end of the resistor R328 is electrically connected with a GND3 port, one end of the resistor R329 is electrically connected with one end of a capacitor C238, and the other end of the capacitor C238 is electrically connected with one end of a resistor R328.
2. A high accuracy circuit sampling circuit as defined in claim 1, wherein: the V + port of sampling main control chip U413 and the one end electric connection of resistance R337, 3.3V voltage is inserted to the other end of resistance R337, the one end and the one end electric connection of electric capacity C237 of resistance R337.
3. A high accuracy circuit sampling circuit according to claim 2, wherein: the GND port of the sampling main control chip U413 is electrically connected with the other end of the capacitor C237, and the other end of the capacitor C237 is electrically connected with the REF port of the sampling main control chip U413.
4. A high accuracy circuit sampling circuit as defined in claim 1, wherein: the OUT port of the sampling main control chip U413 is electrically connected with one end of a resistor R323, the other end of the resistor R323 is electrically connected with one end of a resistor R324, one end of the resistor R323 is electrically connected with the base of a triode Q76, the collector of the triode Q76 is electrically connected with one end of a resistor R325, and the other end of the resistor R325 is connected with 14V voltage.
5. The high accuracy circuit sampling circuit of claim 4, wherein: the emitter of the transistor Q76 is electrically connected with the emitter of the transistor Q77, the base of the transistor Q77 is electrically connected with one end of the resistor R325, and the collector of the transistor Q77 is electrically connected with the other end of the resistor R324.
6. The high accuracy circuit sampling circuit of claim 5, wherein: the collector of the triode Q77 is electrically connected with one end of a resistor R706, one end of the resistor R706 is respectively connected with one end of a resistor R707, a resistor R708, a resistor R709, a resistor R710, a resistor R711 and a resistor R712, the other end of the resistor R706 is respectively connected with the other end of the resistor R707, the resistor R708, the resistor R709, the resistor R710, the resistor R711 and the resistor R712 to be connected with 14V voltage, and the resistor R706, the resistor R707, the resistor R708, the resistor R709, the resistor R710, the resistor R711 and the resistor R712 are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122886174.0U CN216485222U (en) | 2021-11-19 | 2021-11-19 | High-precision circuit sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122886174.0U CN216485222U (en) | 2021-11-19 | 2021-11-19 | High-precision circuit sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216485222U true CN216485222U (en) | 2022-05-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122886174.0U Active CN216485222U (en) | 2021-11-19 | 2021-11-19 | High-precision circuit sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216485222U (en) |
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2021
- 2021-11-19 CN CN202122886174.0U patent/CN216485222U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: High-precision circuit sampling circuit Effective date of registration: 20230113 Granted publication date: 20220510 Pledgee: China Construction Bank Corporation Jiaxing Nanhu Sub-branch Pledgor: JIAXING SOLARWAY NEW ENERGY CO.,LTD. Registration number: Y2023330000177 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |